Luna City Arcade is Peter Hirschberg's home / barn video arcade, with about 60 vintage machines all set up to eat quarters. WaPo story about Peter's dream. You can come around to Peter's Virginia home for Game Day every couple months. [more inside]
Making your own transistor is probably beyond the abilities of a dedicated hobbyist. However, making simple triode vacuum tubes is practical. Many hobbyists have done so over the years. In this video, French ham-radio operator Claude Paillard shows you how. HIs model is the WWI-era type TM of 1915. (and btw, 2007 was the 100th anniversary of electronics, since de Forest made his first vacuum tube in 1907.)
HobbySpace hosts an exhaustive collection of information and links about space-related hobbies, including amateur astronomy, satellite design, and rocketry for both beginners and experts.